The Duke and Duchess meet the French President in Paris

They both met President Francois Hollande at the Elysee Palace in the first of seven official engagements in the French capital

Catherine, Duchess of Cambridge and Prince William leave the Elysee Palace after their meeting with French President Francois Hollande

“It’s not what Britain joined – we joined a marketplace and he ensured it became a supranational state.”

Major did not name names, but his comments were seen to be aimed at leading Leave campaigners such as Boris Johnson, Michael Gove, Iain Duncan Smith and Jacob Rees-Mogg.

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Jacob Rees Mogg has become a popular pro Brexit supporter

He said that having won the referendum last year with "fake facts and bogus promise’s”, the "ultras" were now shouting down anyone who expressed an opposing view in a way that was "totally un-British".

Tory MP Rees-Mogg called his comments an “outpouring of bile”.

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The comments were thought to be aimed at those who joined the Leave campaign prior to the referendum

He added: “John Major’s article is no more than an internally contradictory moan.

“He calls for an end to soundbites with a sound bite and a serious debate with an outpouring of bile. It is pitiable that a once important figure now so belittles himself.”

Major warned that 90 per cent of UK exports to the EU would become more expensive, with tariffs that would add about £6billion to their costs.